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<div id="overview"><a href="../../../../../../../api/org/jboss/netty/handler/codec/spdy/SpdyHeaderBlockJZlibCompressor.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.handler.codec.spdy;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.jboss.netty.handler.codec.spdy.SpdyCodecUtil.*;
<a class="jxr_linenumber" name="19" href="#19">19</a>  
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.buffer.ChannelBuffer;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.handler.codec.compression.CompressionException;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.jzlib.JZlib;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.jzlib.ZStream;
<a class="jxr_linenumber" name="24" href="#24">24</a>  
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/jboss/netty/handler/codec/spdy/SpdyHeaderBlockJZlibCompressor.html">SpdyHeaderBlockJZlibCompressor</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../../org/jboss/netty/handler/codec/spdy/SpdyHeaderBlockCompressor.html">SpdyHeaderBlockCompressor</a> {
<a class="jxr_linenumber" name="26" href="#26">26</a>  
<a class="jxr_linenumber" name="27" href="#27">27</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/util/internal/jzlib/ZStream.html">ZStream</a> z = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/util/internal/jzlib/ZStream.html">ZStream</a>();
<a class="jxr_linenumber" name="28" href="#28">28</a>  
<a class="jxr_linenumber" name="29" href="#29">29</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/jboss/netty/handler/codec/spdy/SpdyHeaderBlockJZlibCompressor.html">SpdyHeaderBlockJZlibCompressor</a>(
<a class="jxr_linenumber" name="30" href="#30">30</a>              <strong class="jxr_keyword">int</strong> version, <strong class="jxr_keyword">int</strong> compressionLevel, <strong class="jxr_keyword">int</strong> windowBits, <strong class="jxr_keyword">int</strong> memLevel) {
<a class="jxr_linenumber" name="31" href="#31">31</a>          <strong class="jxr_keyword">if</strong> (version &lt; SPDY_MIN_VERSION || version &gt; SPDY_MAX_VERSION) {
<a class="jxr_linenumber" name="32" href="#32">32</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="33" href="#33">33</a>                      <span class="jxr_string">"unsupported version: "</span> + version);
<a class="jxr_linenumber" name="34" href="#34">34</a>          }
<a class="jxr_linenumber" name="35" href="#35">35</a>          <strong class="jxr_keyword">if</strong> (compressionLevel &lt; 0 || compressionLevel &gt; 9) {
<a class="jxr_linenumber" name="36" href="#36">36</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="37" href="#37">37</a>                      <span class="jxr_string">"compressionLevel: "</span> + compressionLevel + <span class="jxr_string">" (expected: 0-9)"</span>);
<a class="jxr_linenumber" name="38" href="#38">38</a>          }
<a class="jxr_linenumber" name="39" href="#39">39</a>          <strong class="jxr_keyword">if</strong> (windowBits &lt; 9 || windowBits &gt; 15) {
<a class="jxr_linenumber" name="40" href="#40">40</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="41" href="#41">41</a>                      <span class="jxr_string">"windowBits: "</span> + windowBits + <span class="jxr_string">" (expected: 9-15)"</span>);
<a class="jxr_linenumber" name="42" href="#42">42</a>          }
<a class="jxr_linenumber" name="43" href="#43">43</a>          <strong class="jxr_keyword">if</strong> (memLevel &lt; 1 || memLevel &gt; 9) {
<a class="jxr_linenumber" name="44" href="#44">44</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="45" href="#45">45</a>                      <span class="jxr_string">"memLevel: "</span> + memLevel + <span class="jxr_string">" (expected: 1-9)"</span>);
<a class="jxr_linenumber" name="46" href="#46">46</a>          }
<a class="jxr_linenumber" name="47" href="#47">47</a>  
<a class="jxr_linenumber" name="48" href="#48">48</a>          <strong class="jxr_keyword">int</strong> resultCode = z.deflateInit(
<a class="jxr_linenumber" name="49" href="#49">49</a>                  compressionLevel, windowBits, memLevel, JZlib.W_ZLIB);
<a class="jxr_linenumber" name="50" href="#50">50</a>          <strong class="jxr_keyword">if</strong> (resultCode != JZlib.Z_OK) {
<a class="jxr_linenumber" name="51" href="#51">51</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/handler/codec/compression/CompressionException.html">CompressionException</a>(
<a class="jxr_linenumber" name="52" href="#52">52</a>                      <span class="jxr_string">"failed to initialize an SPDY header block deflater: "</span> + resultCode);
<a class="jxr_linenumber" name="53" href="#53">53</a>          } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="54" href="#54">54</a>              <strong class="jxr_keyword">if</strong> (version &lt; 3) {
<a class="jxr_linenumber" name="55" href="#55">55</a>                  resultCode = z.deflateSetDictionary(SPDY2_DICT, SPDY2_DICT.length);
<a class="jxr_linenumber" name="56" href="#56">56</a>              } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="57" href="#57">57</a>                  resultCode = z.deflateSetDictionary(SPDY_DICT, SPDY_DICT.length);
<a class="jxr_linenumber" name="58" href="#58">58</a>              }
<a class="jxr_linenumber" name="59" href="#59">59</a>              <strong class="jxr_keyword">if</strong> (resultCode != JZlib.Z_OK) {
<a class="jxr_linenumber" name="60" href="#60">60</a>                  <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/handler/codec/compression/CompressionException.html">CompressionException</a>(
<a class="jxr_linenumber" name="61" href="#61">61</a>                          <span class="jxr_string">"failed to set the SPDY dictionary: "</span> + resultCode);
<a class="jxr_linenumber" name="62" href="#62">62</a>              }
<a class="jxr_linenumber" name="63" href="#63">63</a>          }
<a class="jxr_linenumber" name="64" href="#64">64</a>      }
<a class="jxr_linenumber" name="65" href="#65">65</a>  
<a class="jxr_linenumber" name="66" href="#66">66</a>      @Override
<a class="jxr_linenumber" name="67" href="#67">67</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setInput(<a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> decompressed) {
<a class="jxr_linenumber" name="68" href="#68">68</a>          byte[] in = <strong class="jxr_keyword">new</strong> byte[decompressed.readableBytes()];
<a class="jxr_linenumber" name="69" href="#69">69</a>          decompressed.readBytes(in);
<a class="jxr_linenumber" name="70" href="#70">70</a>          z.next_in = in;
<a class="jxr_linenumber" name="71" href="#71">71</a>          z.next_in_index = 0;
<a class="jxr_linenumber" name="72" href="#72">72</a>          z.avail_in = in.length;
<a class="jxr_linenumber" name="73" href="#73">73</a>      }
<a class="jxr_linenumber" name="74" href="#74">74</a>  
<a class="jxr_linenumber" name="75" href="#75">75</a>      @Override
<a class="jxr_linenumber" name="76" href="#76">76</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> encode(<a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> compressed) {
<a class="jxr_linenumber" name="77" href="#77">77</a>          <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="78" href="#78">78</a>              byte[] out = <strong class="jxr_keyword">new</strong> byte[(<strong class="jxr_keyword">int</strong>) Math.ceil(z.next_in.length * 1.001) + 12];
<a class="jxr_linenumber" name="79" href="#79">79</a>              z.next_out = out;
<a class="jxr_linenumber" name="80" href="#80">80</a>              z.next_out_index = 0;
<a class="jxr_linenumber" name="81" href="#81">81</a>              z.avail_out = out.length;
<a class="jxr_linenumber" name="82" href="#82">82</a>  
<a class="jxr_linenumber" name="83" href="#83">83</a>              <strong class="jxr_keyword">int</strong> resultCode = z.deflate(JZlib.Z_SYNC_FLUSH);
<a class="jxr_linenumber" name="84" href="#84">84</a>              <strong class="jxr_keyword">if</strong> (resultCode != JZlib.Z_OK) {
<a class="jxr_linenumber" name="85" href="#85">85</a>                  <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/handler/codec/compression/CompressionException.html">CompressionException</a>(<span class="jxr_string">"compression failure: "</span> + resultCode);
<a class="jxr_linenumber" name="86" href="#86">86</a>              }
<a class="jxr_linenumber" name="87" href="#87">87</a>  
<a class="jxr_linenumber" name="88" href="#88">88</a>              <strong class="jxr_keyword">if</strong> (z.next_out_index != 0) {
<a class="jxr_linenumber" name="89" href="#89">89</a>                  compressed.writeBytes(out, 0, z.next_out_index);
<a class="jxr_linenumber" name="90" href="#90">90</a>              }
<a class="jxr_linenumber" name="91" href="#91">91</a>          } <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="92" href="#92">92</a>              <em class="jxr_comment">// Deference the external references explicitly to tell the VM that</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>              <em class="jxr_comment">// the allocated byte arrays are temporary so that the call stack</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>              <em class="jxr_comment">// can be utilized.</em>
<a class="jxr_linenumber" name="95" href="#95">95</a>              <em class="jxr_comment">// I'm not sure if the modern VMs do this optimization though.</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>              z.next_in = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="97" href="#97">97</a>              z.next_out = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="98" href="#98">98</a>          }
<a class="jxr_linenumber" name="99" href="#99">99</a>      }
<a class="jxr_linenumber" name="100" href="#100">100</a> 
<a class="jxr_linenumber" name="101" href="#101">101</a>     @Override
<a class="jxr_linenumber" name="102" href="#102">102</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> end() {
<a class="jxr_linenumber" name="103" href="#103">103</a>         z.deflateEnd();
<a class="jxr_linenumber" name="104" href="#104">104</a>         z.next_in = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="105" href="#105">105</a>         z.next_out = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="106" href="#106">106</a>     }
<a class="jxr_linenumber" name="107" href="#107">107</a> }
</pre>
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